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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c3cf4fb893bbbebb7d778bd9b8e7e0846fbe52dfdc0a04b06c0adb60b7fe4f' 
  AND token = 'knh7pse0wdjFJordjM0YTOuatMvLREMpPvG9aBh3FsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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