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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67cf26195f02cbb0fca948a13e16319ae0cb68b50ec0a1161043312fe26ed70' 
  AND token = 'gH+52pnqQVujI3Oh9U7HFUb9REbPF9cwwub+ZjbtMbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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