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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a070a362b38047ddf26b28ed27f6d472e6b19c1c99f483bfb5824405e6f3b5e9' 
  AND token = 'fW46m3Fl0OdcYAyxUUsoEUVs+LWR1xs8GzshbrQw+Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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