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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9839a42d45b783b4f5b42812605120ec2f7dfe1ac84f3dc8ca2b81dc840f19' 
  AND token = 'j/i4lNe4/8hEoJWdqVcEVQE8uyUci0xRNO/17NVBdh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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