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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104d169df2bb9c4079507a7946c2aa93a3ab71924f69f5451bc31b027d1bbe8b' 
  AND token = 'aLh04r3g4NQ2J2n57G/MQJ9HWxRBJ3vGIaGsR8otnrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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