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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32ef5c61dfc1efff7a6644fb99fee55f08b4c9c196fde2f3a0d9931fd94b6e2' 
  AND token = 't7cYyz4Kp+baP31Pb3+6l0dKk6nc7ixFRzDtr29Fhr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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