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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00082d9bdd8a483718e94e320f6c531a70062119d62b561a445e81bc1fe1ed85' 
  AND token = 'rm1zmYxChMJtKZu+Aukw+T9lE06tPiLx2DkQGimvSjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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