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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9583afdf2df6623ac60941ddb7ffb22d0202c30109d6c29e600ad8cd01dfb08' 
  AND token = 'c1mOMWmIbBhvPVypkHj/QEde+x5v/v+cFgU3jlv/Mhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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