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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548818c031e24e09102ae66bf39a69ca02697006b0a8f7d9d2ccffd05e572226' 
  AND token = 'tRgUz8fPZDc5LpNg9N8ERgZnKaTImQB13tLLMZrHWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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