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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315799e859beeca6c8a86eadd250804f5186383f8b0b2fc295af49f34537955a' 
  AND token = 'tVqtvc97SauTNO3pAvWUw90uX7DSfeBA49AtYFXeLhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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