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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd11b329955ce42f9a07f82ca4d4dc44ed443c494b26e541cd0d79fddb0d02e' 
  AND token = 'swmXBB3ziWNCSid02YpU0AS2sGSa2JjG3CW5Ld8FEOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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