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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70254a3a2a4739425bf4426f7ce050a654a79d0777595b1260a54d4e91ebc8f' 
  AND token = 'I7/l5RJ45ih4ZVlijcxeMUihMevGIkxaL6WvupEiP1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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