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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f937adba27fd7faf31ca7eeedd2a2d8faf05f18036dc3401cddc0a533cc620' 
  AND token = 'GYtZc9iTbhQuwD0aEOTfe7q6dWRO1AohXRQfQ86B/44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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