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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a69e30325a4e602674358ba5baf5cc24d8a00872a1b9ee01c259585bb18c98a' 
  AND token = '+XyJKcQuR7CnF7UQmXrj04xTMH4TiUfi/AUJbtma+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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