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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1309609bfbd381df44b8110a298e31a3ffd4b8a737062ca9e574813d302ee313' 
  AND token = 'X7dd9PRcGtAykkJWEN4D3JeOJDBiiwTAnX5UvUShi8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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