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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6ce9939f6a6dd89147c1c0675ad988396c90ea60c321b40a672e053aa0ef19' 
  AND token = 'B1CoAAnjFZWHbMTG2vhD1ui4IH0rIbT2BIvh/IiiXVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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