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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a633ec0b822184fb631654aa0aa4616ab50718afe2a4aced23b2f04e2c5dda0' 
  AND token = '3hlokNGVW8yLn/VzQYDLqS6VjwN24CH9uiMXRYrk+6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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