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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d5706457d0232e8233616e43f9add9be7f53456f2def75f9920d1a43a96806' 
  AND token = 'Z3aapYNJGea5thbE8snD3ZvaMADpmvECBn2Ar0YsEIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}