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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25a43922b2059f38dab6e6fd632ecb26e6246c6465f7432032ddf94b25d1bda' 
  AND token = 'wJSOOO+Py8ICKDIZ7eeHL6Sb9Fr2GfNZ3V4sWvxTQ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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