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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e1fc7e61f3d271b16d10a2b328bd50b86cea6472aee3ba1ededa6a8869f807' 
  AND token = 'yNWaFdV2zBJzr4m5iqfu+ZPBV9cwl+l3M5ZcDk5KPKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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