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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be0bf50efa350ad3026924ca3fc5594cf646872ac3c1ed0d838bfb7d1ce9710' 
  AND token = '7+aaMeCSjMe8/VTzxwipn2wgiiErAqOCN7V1duMeerQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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