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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e8eb1414048f6c8cbc5243eca8bcb0e3d8920a87ee0f29cd8ea955881cb950' 
  AND token = 'MFIlVq+xc22/nSGzDIbANs7h28kq/3XVVC1XBlQW0PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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