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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b202917a7e66c97a731d4fa04da1c1eea87265eabf886d150fd4ad8794b677f7' 
  AND token = 'SkeHih5u9a10phLBeptVeRDLhgzDnIg94K5H7CtqWJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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