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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0354bcb8345d9d3462a4c97139587a44a699a1934ece055ab3f04428cbb9da7a' 
  AND token = 'c1z9QkJa8WNKDI59JfHiZjgbcSkcEqNtynIbkNGiYjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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