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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2395b82a263c74c460e6e16022ef555cfd21ed24af0dc6c1a302c1ade6c6dde0' 
  AND token = 'F0f8q9W0xJqWP1SC1ybLn0ReCJ9s6W1aQG5ER4lR4u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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