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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16d4649c80114c6b0aab93e2d5af57ce61328bae4ec87479d9ffdaac5d800e1' 
  AND token = 'dJhcer9CURi1oTG5X1P1jX5Add1QaKrdyUWYcfmLw9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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