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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c768d1b33f306d35c1ef7e2f9db954232b1938fe30731040dbb57906b803fbbe' 
  AND token = 'LbT9wycbkLKLKrP+6djF8uRfzNIs+lqPX5TaOBXE0b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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