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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6990b802855e703bc6b8fcb3391111963b4dd846113a0b4fa01af4ac0a6c755' 
  AND token = 'bNTq61rfYxu1KSQlMuZKF6h5c1p7nfKoSaqQmhLZS3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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