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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1f87e4303d6737bde55168e09f20af6e8f01867684f2800b425382b4951263' 
  AND token = 'TNPM4/PKImq931MEE7aAIkLGYnNsUUqFgEqdjNpBxN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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