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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfbfbbac206a14e0a50ca06569c3b9931201196f1f4e1a13baddd6163672535' 
  AND token = 'dZnPft5Jy092b1JyAdwz6amKWT6vnOlcZ6Mhhv9fYXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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