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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6879970e4ea6b55a431d5f9ed508727dddcb531b88a1d8a0d68c858caa057956' 
  AND token = 'K9a5zLvxSbzfPUuU13QQc2vPIaFLccgunVMqJ4y9MKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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