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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ee1272cc5f7cc202b357a883d4f15593e5ceba73116fa6e24abae3b63c8a00' 
  AND token = 'AWlIrd0WkmIBkO7pi4IKEdnVJ/76vn8TJ50KwAgvO/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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