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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a7e53ce3566c4cb52a3f17ae55d8d0d274b56f396e2a17bf216b1911ceac5f' 
  AND token = 'lCdvC21v1q1KJzHBXV7E33Pg1aPlEdAT2oiBsA4B5Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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