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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941fc45ff659c986a3e44ac03c62561eb0be5de7ccd889a3fa7d6566ad55e95e' 
  AND token = 'nGpUe7oPP4lFO6WDTw3x6774CfSmSmrLSWxUrGNuCns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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