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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a347b2858996906cd28a62620b5ba10ec2ebf8dd91d2c0180d9994ef5123fd' 
  AND token = 'Phz9s3rWz4KCoF3YF+F335FB9kauYP2kzG6cLTlcQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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