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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4eaec96ac1fee4ce891131e3974a3d572945f907dcfa07fde5e2bb129a2bb30' 
  AND token = '7BNwcWx/1xUUICmqv40eauag+mO0ioOodeYjGLW/lLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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